Showing posts with label years. Show all posts
Showing posts with label years. Show all posts

Part-Time and Full-Time Employment Means Fewer Babies

It is not work in general that is causing a decline in women giving birth at a young age. It is specifically temporary jobs that are responsible. In Australia part-time and casual employment has boomed over the last decade as employers see it as a way to keep costs down. Many work extra hours for no money at all, afraid of losing their jobs.

Women working full time can afford to pay for child care, or at least for critical periods when they are working. Such career women are having children before they reach the age of 35 years. There is a myth out there that it is these career women who are starting families at an older age. Oddly the effects of not working full time changes the behavior of women in the high socieconomic group as well. They may be able to afford childcare from a financial "nest egg", but it is the state of mind about not working enough and not having sufficient income for a family.

Financial security in regard to income is essential for women to even consider having children. Careers are not that important to women. This goes against all of the prevailing stereotypes. The number of years spent in part-time work had a strong impact. A year of part-time employment reduced the probability of having a baby by 35 years by 8 per cent. Five years in such work increased the rate to more than a third.

Another myth is that university graduates go straight into full-time employment. Over 60 per cent of these began working in a job with reduced hours. Therefore, high and low-skilled women suffered the same job market problem.

All economies are moving to less-secure employment to reduce production costs. This means that as the decades go by the world population will fall, confounding all predictions. Furthermore, the population in most countries will have a larger proportion of elderly people. Some of these will have to work to survive. Providing old age pensions will become too costly.
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Economics by Ty Buchanan
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Dinosaurs Found in Australia - What is Fact?

Australia is a very old continent. It seems the ancestors of Tyrannosaurus rex lived here. A hip bone has been found that dates to 110 million years ago which is 40 million years before T.rex roamed elsewhere on earth. Until now it was believed that T.rex only lived on northern continents.

Many of the things stated as fact by scientists are indeed just matters of faith until they are "proven" otherwise. Scientists argue about when dinosaurs developed feathers and why. They claim that birds today are direct descendants from dinosaurs. This is like saying humans are descended from dinosaurs. Much evidence points to birds having a line of descent completely separate from dinosaurs.

The same rings true with the Hobbit people of Flores Island. Some scientists will not accept that people different from humans survived until 18,000 years ago alongside humans. Neanderthals lived until 50,000 years ago, so why not another type of human? Science is much like religion. What is just theory is put forth as fact. Ah, the dangers of religion - and science!
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Conservation
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Fish Fossil Sheds More Light

There are new facts about the evolution of fish. An ancient fish fossil has provided preserved muscle tissue. European and Australian scientists have examined a placoderm fossil 380 million years old. Early fish did not have moving jaws with joints. Their mouths were fixed partially open, though they could still move.

Jaw structure was presumed to be like sharks, because that was taken to be a living example. The fossil has changed this assumption. It shows a pronounced shoulder structure. From this girdle neck muscles attached to a dermal joint. So the head moved relative to the body but the jaw did not. Sharks do not have joints in the neck - their necks are flexible.

Another difference is musculature in the abdomen much like four-limbed vertebrates such as horses. Rather than being a evolutionary step for four-legged animals it was fully developed by placoderms, the first vertebrate with armoured plates and no teeth.
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Conservation
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Humans Did Not Kill Off Megafauna

During the Middle-Late Pleistocene, one million to 10,000 years ago, more than 50 species of animal disappeared, the last to do so 46.4 thousand years from the present. The reason for the demise of the giant creatures is hotly debated. Some scientists claim that the spread of Man across the globe was the cause. This is suspect, however, because there were so few of them. Killing the odd animal would not have made a significant impact.

Many believe that the end date for megafauna is incorrect. As stated above, the theory that humans killed them off by definition means that people and animals lived side-by-side for a considerable time. Evidence in Australia certainly points to this - 13 species of large animals were here on human arrival. Moreover, the people mainly relied on subsistence strategies for food. Their weapons were not very efficient. A boomerang is highly inaccurate and the range of a spear is limited.

Megafauna died out over a long period of time, not all at a specific date. Species lingered on in many regions. Just assuming that humans killed them is a mistake and diverts from the discovery of why the large animals became extinct. This was a time of extremes in climate. Perhaps a series of wild swings in climate gradually reduced their number to the tipping point where reproduction did not take place.
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Society
TwitThis

New Classification System for Bird Species

Birds are the most diverse creatures on Earth.  Not only have they changed into different species on large continents, they have also adapted specifically to environments on islands.

A new classification system is in the form of a circle with increasing diversity as one moves out in time from the center.  different types of birds are correctly located on the figure covering a period of 50 million years.

There is not one specific ancestor.  "Base" species take the form  of a circle of time moving out from the center and new kinds of birds branch off directly to the outer edge.  Fast evolving birds are in red; slower ones are drawn in blue.

Significantly birds such as woodpeckers often split into new species, while hornbills, for example, did not.  There was more diversification in the Western Hemisphere.  Furthermore, species did not proliferate in the tropics because the climate remained stable there over a long period.
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Biology
TwitThis

Mammoth Cloning Still Not Possible

We have heard so much about how scientists are going to clone a mammoth. For many this idea remains "pie in the sky" - a lot of talk and no action. There is plenty of mammoth raw material around to do tests on. The problem is getting good DNA that can be cloned.

Scientists are jumping up and down again with the recent find of a frozen mammoth in Siberia. They say this time their will be "living cells". This is very optimistic. The new mammoth will probably be like all the others. Only partial DNA will be found. Even though bone marrow has been identified this time, cloning is a long shot. No living cells have so far been found in any extinct animal, as far back as 10,000 years when mammoths roamed the Earth.

There are problems in analyzing human DNA even though the human genome is known. The complete DNA of mammoths has not yet been determined. A prize is offered by the X Prize Foundation for the first cloned extinct animal. Scientists can hope I suppose.
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Science
TwitThis
Alien predators are the main danger to the survival of Australia's native wildlife. Foxes and cats are clearing many areas of native animals. Indeed, Australian fauna has been the hardest hit in the world. Bettongs (rat-kangaroo) and wombats for example are oblivious to the danger when a cat or fox is present.

Australian prey have developed camouflage to defend themselves from native predators, but alien predators can see through this.

Thousands of years of isolation have made native fauna vulnerable. Other continents have long had the cat, goat, grey squirrel, mouse, pig, rabbit, red deer, red fox and ship rat, so their native animals have learned to survive and avoid extinction.  Responsibility lies clearly with early European immigrants.  The damage was done a few hundred years ago.
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Conservation

Gamburtsev Subglacial Mountains' Mystery Solved

The mystery of how the Gamburtsev Subglacial Mountains in the Antarctic was formed has been solved. The range is at a high elevation and was only discovered in 1958. It is buried under 3,000 meters of ice.

A group of scientists used aircraft with magnetometers, gravity meters and ice penetrating radar. They found that the mountains had been there for a billion years. The range spreads out in a 1,800 long earth fracture reaching from the eastern Antarctic to India.

This region of the Earth has been relatively free of tectonic activity. A billion years is short in tectonic terms, so the mountains have sharp edges not greatly worn away by water, wind and snow.

The rift system also contains the largest subglacial lakes on the Antarctic continent. Before animals roamed the Earth micro-continents collided to form the thick crustal root on which the mountain range stands. As the mountains eroded the root was preserved, frozen by the bitter cold. When dinosaurs existed 250,000 years ago supercontinent Gondwana broke away, the crustal root warmed which pushed the mountains even higher. Less than 50 million years ago the Antarctic ice formed over the range protecting it again.
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Geology

University of Queensland Blunders on Data

New research shows excessive watching of television is bad for your health. This is commonsense really. When you are watching TV you aren't doing anything physically. It is claimed that for every hour of TV one's lifespan is reduced by 22 minutes.

Many people watch eight hours of television each day, so the calculation is,

8hrs x 30Years x 365Days
-------------------------------- = 3.7 years lost.
65.5(22 minutes) x 365Days

OR,

8hrs x 365days 30yrs = 87600hrs total

87600hrs x 22mins
------------------- = 32120hrs total
60

32120hrs
--------- = 3.7 years lost
24 x 365


Just how did they reach this specific conclusion? Apparently obesity and diabetes were mentioned; then the figure was just fished out of the air.

They chose a ridiculous figure of two hours of TV every day over a lifetime. No one watches this tiny amount. They even decided that men were affected more than women: 1.8 years lost for men and 1.5 for women. Because women live longer the calculation should show a greater loss for them!

The University of Queensland should be careful about releasing such nonsensical information. The institution will lose all respect.
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Society